A place for ship-lovers to watch the passage of freighters traversing the Great Lakes while learning about their history.

Concrete strongholds stand guard over the Golden Gate.

The highest point in New Jersey is marked by a massive, if simply named, obelisk.

This Delaware River bridge is emblazoned with a catty slogan from a more prosperous time.

A popular place to pick up prehistoric coral fossils from the time when Michigan was an ocean.

Legs Inn provides Polish food, a cornucopia of Odawa artwork, wood carvings, and mounted deer heads.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

The world's longest known cave system.

The only Bahá'í house of worship in North America and one of only a handful worldwide.

Wisconsin's most celebrated export gets the royal treatment on I-94.

An icon among Florida's pre-Disney tourist attractions, just west of Orlando.

The third tallest lighthouse in America once guided author Stephen Crane to safety.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

Location of a reliquary containing bone fragments of 18 saints.

In this case, 'zero' marks the spot where the iconic Old Spanish Trail ends.

The world's tallest doric column is this Ohio monument to a naval victory in the War of 1812.

World's largest Christmas store.

Center filled with hands-on displays served as a tribute to several astronauts with connections to the state.

The Beaux-Arts aquarium boasts a vast collection of saltwater and freshwater fish on an island in the Detroit River.

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

These enduring murals depicting a distinctly Marxist tribute to capitalism could not even be defeated by McCarthyism.

Astounding collection of coin-operated games and automata.

Hell on Earth is actually a small town in Michigan where anyone can be mayor for a day.